/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef SKY_ENGINE_PLATFORM_FONTS_LATIN1TEXTITERATOR_H_
#define SKY_ENGINE_PLATFORM_FONTS_LATIN1TEXTITERATOR_H_

#include "flutter/sky/engine/wtf/text/WTFString.h"

namespace blink {

class Latin1TextIterator {
 public:
  // The passed in LChar pointer starts at 'currentCharacter'. The iterator
  // operates on the range [currentCharacter, lastCharacter]. 'endCharacter'
  // denotes the maximum length of the UChar array, which might exceed
  // 'lastCharacter'.
  Latin1TextIterator(const LChar* characters,
                     int currentCharacter,
                     int lastCharacter,
                     int /*endCharacter*/)
      : m_characters(characters),
        m_currentCharacter(currentCharacter),
        m_lastCharacter(lastCharacter) {}

  bool consume(UChar32& character, unsigned& clusterLength) {
    if (m_currentCharacter >= m_lastCharacter)
      return false;

    character = *m_characters;
    clusterLength = 1;
    return true;
  }

  void advance(unsigned advanceLength) {
    m_characters += advanceLength;
    m_currentCharacter += advanceLength;
  }

  int currentCharacter() const { return m_currentCharacter; }
  const LChar* characters() const { return m_characters; }

 private:
  const LChar* m_characters;
  int m_currentCharacter;
  int m_lastCharacter;
};

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_FONTS_LATIN1TEXTITERATOR_H_
